The bones connected to the Spline IK do not follow the whole armature - Still need help
Image above Showing a bone chain controlled by a Spline IK Constraint

Consider using the Chain Offset feature as enabled .  This is indicated by the yellow arrow.


Please know there is a technique in modeling with regular IK constraint where there are 3 models. Model 1 tweens or has a linear interpolation of the other two models. Bones capture rotation, so rotation can be interpolated. Depending on your level of experience and patience this technique can be appropriate or in appropriate. 
Bones can have a copy rotation constraint.